Helka is known for its extremely varied and hard to predict eruptions 
 Telegraph.co.uk (excerpts):  One of Iceland's most feared volcanoes looks ready to erupt, experts said on Wednesday, raising fears of a new ash cloud halting flights over Europe.  The Helka volcano is close to the ash-spewing Eyjafjallajokull, which last year caused the biggest closure of airspace shutdown since the Second World War, affecting more than 100,000 flights and eight million passengers.  "The movements around H...
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